I recently upgraded from a Canon T1i to a Canon 5D MKII and have sold my longer lenses, my 75-300mm f4-5.6 III, which was a terrible lens, and a 28-135mm IS USM. The only sort of telephoto lens I have right now is a Sigma 105mm macro. I have a budget of about $800 US and I am not sure what lens to go for in Canons large range of telephotos. I have manly been thinking about getting a 200mm f/2.8 II as I want to do portraits and I think that this would be a good length on full frame for portraits. When I had my T1i, I would use my 50mm 1.8 II, but now this seems to be a bit too wide for portraits as it has more distortion then I would like. When I do portraits, I do them outside so distance away from my subject wouldn't be much of an issue but I am a bit concerned about my control over dof, would there be to much when doing body shots? Would I better off just using my 105mm for portraits?
I'm going to Hawaii for spring break and would like to capture more shots of birds and stuff, would the 200mm be a good choice, also what is the difference between the 200mm f/2.8 i vs ii?
Here is some of my portrait work with my 50mm on my T1i
Here is some work I've done with my 105mm on my T1i
Here a shot with the 105mm on my 5D
Sorry for the randomness of my post, I'm just not sure what to go for.